Well from what I have seen you can get a lot for an A4000 with good stuff in it here on the US Ebay site. I've allways wanted to get one, but my A3000 is so loaded I dont see the point any longer. Here is an example of what people ask for them. Though This one started way to high to attract any bidders.
http://cgi.ebay.com/ws/eBayISAPI.dll?ViewItem&item=2749342369&category=4598
